Improvement in tuck-creasing attachments for sewing-machines



S. P. BABCOCK.

improvement in Tuck Creasing Attachment for Sewing Machines.4

Patented April 1'6, 1872.

kunnen UNITED SfrAf-rns SYLVESTER P. BABCOGK, OF ADRIAN, MICHIGAN.'

IMPROVEMENT IN TUCK-CREASING ATTACHMENTS FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 125,782, dated April 16, 1872.

ing drawing and to the letters of reference marked thereon and being apart of this specification, in which- Figure 1 is a perspective view of my creaser; Fig. 2 is an elevation of the outer end of the presser-arm and the operative parts at the completion of the downward movement; Fig. 3 is a perspective view of the cam which clamps the cloth-smoother; and Fig. et' is a vertical section of the parts shown in Fig. 2, when, in the downward movement of the presser-a-rm, the post has come in contact with the cloth, but before the creaser has reached it or commenced to operate. Fig. 1 is drawn to full-size scale, and the other figures twice the actual size.

Similar letters of reference indicate corresponding parts in the several gures.

The nature of this invention relates to an improvement in that class of tuck-marking attachments to sewing-machines in which a crease is formed in the fabric on the line on which it is to be subsequently folded, whereby the fabric is held by a movable post or presser while a fold or crease is made therein in the peculiar manner set forth in the following specification; and it consists in the novel and peculiar construction of the operative parts and their arrangement with relation to each other, the bed and gauge plates, and the arm or needle-bar of the sewing-machine which operates them, which I shall now proceed to describe.

In the drawing, A represents the base-plate,

which is secured to the cloth-plate of the sew-y ing-machine by a thumb-screw passingthrough the hole a. B is a gauge-plate slidin gin grooves formed by turningup the edges of the baseplate over the sides of said guage-plate. b is the guide or gauge for the fabric beingsewed, formed by turning up the front edge of the plate B, which has also a longitudinal slot, c, through which the thumb-screw passes; when pushed back until the gauge strikes the turnedover lips of the base-plate, as seen in Fig. 1,

the gauge would be on a line with the needle of the machine. If the guide-plate be retracted or pushed to the right from the position shown in Fig. 1, it will give the width of tuck, and can be secured in any position by the collar of the thumb-screw, which iastens itand the base-plate to the cloth-plate of the machine. C is a pressure-plate, extending laterally from a long plate, C', which slides through the gauge and guides at the other end of the guage-plate. D is a cloth-smoother, lying on the plate C', to which it is secured at the rear end. The smoother is pressed down upon the fabric by a cam, E, pivoted on the gauge above it. The pressure on the cloth may be decreased by sliding the block F along under the smoother toward or underneath the cam. Gr is the press- A er-arm, which is connected to the rear end of the plate C .by a C-spring, G 5 on it slides a tie-plate or piece, H, through which the needle passes, and by which the arm or needle-bar of the machine carries the presser-arm downward. The end of the presser-arm is bent up and then sharply downward, running into a hollow post, I, which is provided with the vertical longitudinal slots d, through which a horizontal stud or bar, J, is screwed into and through the pendent end of the presser-arm, its rear end projecting into the rearmost slot d. The lower end of the post is closed by an inclined serrated face-plate, which comes down upon and retains the fabric. Above the face-plate referred to are two holes, e, inline with the slots above. K is a nipping-lever pivoted to the louter end of the bar J, with an inward-projecting guidepin, f, near the lower end, which projects into the outermost hole c. A spiral spring, g, is coiled between the top of the post, anda pin, h, about the pendent end of the presser-arm. The width of tuck is determined by moving in the gauge b toward the base-plate, and the space between tucks by slidingl out the plate C'.

It will be observed that, as the presser-arm descends, when the post has come against the fabric lying upon the pressure-plate C, it continues its downward movement, sliding into the post and carrying along the bar J, which slides in the slots d, when next the lower edge of the lever comes into contact with the fabric. As the downward movement continues the lower end of the lever is forced toward the foot of the post by the pin f in the hole e, carrying along v a small fold of the fabric, which is creased by the pressure it is subjected to between the lever and post, which are then in the position shown in Fig. 2. When the needle-bar has completed its 'downward stroke and commenced its upward movement, the spring G throws up the arm, when the operative parts assume the several posit-ions shown in Fig. l.

It will also be noticed that in drawing the fabric to make vthe crease it is effected while that part nearer the needle is immovably held by the post, consequently there will be no irregularity in the seam, nor danger of tearing very thin fabrics.

I am well aware that tuck-creasers are in use which pinch a J[fold in the fabric with either one or two nippers or springs; they are different in construction and operation from mine, in which'a post pressed upon the fabric holds it immovably, while the creasing is effected by a lever pressing a fold of the fabric against the `footof said post, which is attached to the presserarm7 and not -to the base-plate or stationary part ofthe gauge, the movement of the lever K toward the p'ost not being effected by the imping'ing of the foot of said lever on the fabric, but by the action of the guide-pin f in the manner shown.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The arm G, post I provided with slots d d and holes e e, the spring g and pin h, the bar J, nipping-lever K, and pin j', all constructed and operating substantially as and for the purpose set forth.

2. The plates A B C C', arm G, spring G', tiepiece H, post I, spring g, bar J, nipping-lever K, and guide-pin f, all constructed and arranged as and for the purpose set' forth.

SYLVESTER P. BABCOGK.

Witnesses:

H. F. EBERTs, MYRON H. CHURCH. 

